Fire-extinguisher.



l J. EMMETT. FIRE EXUNGUVISH'ER. 'APPLICATION' FEILED JUNE 23| i914.

Patente Ju1y'13, 1.915.:

JOSIH EMMIETT, 0F CHICAGO, ILLINOIS.

FIRE-EXTINGUISHER.

. speeieaiion of Letters raient.

Application iled .Tune 23, 1914:. Serial No. 846,537.

To all whom it may concern Be it known that I, JosiAi-i EMMEN, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Fire-Extinguishers, of which the following is a specification.

This invention relates to lire extinguishers, and relates particularly to sprinklers for automatic sprinkler systems.

The primary object of the invention is to provide an improved fusible link or strut for such sprinkler which, in addition to the requisites of strength and sensitiveness to heat, shall be safe and dependable in use, so that they will not break under the stresses to which they are subjected in use, until fused in the manner intended.

To this end, a fusible strut or link of my invention comprises the various features and details of construction hereinyafter described and claimed.

In the accompanying drawing, in which' my invention is fully illustrated, Figure 1 is a perspective view of a sprinkler head having a fusible link or strut of my invention. Fig, Q is an enlarged front or face view of the side of the link or strut which is exposed in Fig. l; and Fig. 3 is a sectional view of said link or strut on the lines 3-3 of Fig. 2.

Referring now to the drawing, A. designates, as a whole, the frame of the sprinkler. Said frame A may be of any desired or approved construction and will be readily understood by those familiar with the art without a detailed description thereof.

As shown', the sprinkler is of the type in which the fusibleI link or strut is applied to secure the cap l yin position to close the l nozzle of said sprinkler, by means of what may appropriately and for purposes of convenient reference, be called toggle levers, re

`spectively designated 2 and 3, the relation being such that, in use, said link will be under tension. My improved link or strut may, however, be used in other usual and well known ways and I do not, therefore, desire to limit myself to the manner of use shown.

My improved link or strut, designated as a whole a, consists of enly two members 4 and 5, which are made of suitable metal, being preferably stamped from sheet phosnected.

phor bronze and being of proper Width and thickness to afford requisite strength, not only in the metal itself, but in the solder joint by which said strut members are coni Operating in tension, relatively thin metal may be used,a desirable thickness being about l? gage sheet metal, while a solder joint of adequate strength will be provided, by making said strut member fiveeighths of an inch wide.

The link or strut members fl and 5 are of the same size and shape, thus requiring but a single pair of blanking dies for stamping the same, and are symmetrical on both sides of a longitudinal center line. To provide for engaging the toggles 2 and 3 with the link or strut a and to permit said toggles to separate when said link fuses, each `of the strut members 4: and 5 is provided with a hole 6 in one end thereof and a slot or notch 7 in its opposite end, and l"said link or strut members are soldered together with the slot 7 in one end thereof/in register with the hole 6 of the other, /thus providing` for pulling said link or trut members apart endwise, as contempla ed.

To increase the strength of the connection between the link or strut y'members 4 and 5, the links are provided, preferably' at their centers, one with a projection 8 andthe other with a recess or socket 9 to 'receive said projection, the engaging sidespof-s'aid projection and recess being-inclined -or tapered from the/base to the tip or apex of said projection. As shown, the engaging sides of said projection and recess are curved, being practically hemispherical. My invention, however, contemplates other forms of projection and recess and I do not. therefore, desire to limit myself to t-he particular form shown. Also, to insure uniform and reliable operation of said link or strut and thus of the sprinkler, a. liole or opening l0 is formed through thel link or strut member in which the recess or socket 9 is formed, which will permit any gases to escape Which'may be produced and which otherwise might accumulate at the bottom of said recess, by the soldering operation.V Said hole or opening will also break the adhesion between said link members due tothe exclusion of the air. Also, to bring the line of the pull or tension of the toggles and 3 in the plane of the contacting sides of said link or strut members, the extreme ends of said link or Patented duly t3, i915.,-

A tion v thereof.

strut members are olf-set on .opposite sides lthereof a distance equal to one-half the thickness of saiilink orstrut members.

The 'operation of my improved sprinkler will be vreadily understood by persons familiar therewith, Without a detailed descrip'- I claimz- .l -LA fusible link comprising overlapping members, soldered together, one of said 'members provided with a tapered socket and the her with a corresponding'taperedA projectiol which engages said socket, one thereof being provided with a vent; hole which communicates with said socket, sub'- stantially as described.

2. :A .fusible link comprising overlapping members soldered together, one .of said members provided with a centrally located spherical socket and with a vent hole which communicates with said socket, and the Aother with a corresponding centrally located spherical projection which engages said ALEX D. KING, Jr., S. A. HAWKINS. 

